Infinite coupling magnon theory of quantum Heisenberg magnetic models of spin s
Abstract
Description
An infinity magnon coupling term is introduced into the Holstein-Primakoff transformed forms of the Heisenberg ferromagnetic and antiferromagnetic models of any spin $s$ to rigorously remove the unphysical magnon states. This term makes the series expansion of the square root of the magnon operators become a finite series of magnon operator products. Under a simple Hubbard-like approximation our infinite coupling theory yields much better result than the existing spin wave theories, especially near transition temperatures.
LaTex with two EPS figures included, uses epsfig and espcrc2.sty
LaTex with two EPS figures included, uses epsfig and espcrc2.sty